I've battled insomnia my whole life. I've tried every resource under the sun.
I've tried melatonin in the past and did not have much luck. Now in my recent sobriety, I'm using it and it's working great. I take 2 - 3mg. tablets about a half hour before going to bed. In the past, I only took one, but after doing some research on the Internet, I found different dosages.
It helps me fall asleep, but I have always been a light sleeper. I wake up anywhere from 3-5 times a night. You may also want to look into a homeopathic remedy called Calms Forte. That has worked fore me in the past.
Good Luck!